SOUTHEASTERN ASSET MANAGEMENT INC/TN/: MATTEL INC (MAT): Quarterly 13F Position History
As of Q1 2026, SOUTHEASTERN ASSET MANAGEMENT INC/TN/ reported 12,812,157 shares of MATTEL INC (MAT), worth $186.2M and representing 9.2% of its 13F equity book. Quarter-over-quarter share count change: + 4,241,829 (+49.5%) . The position first appeared in Q3 2017 and has been disclosed across 35 13F-HR filings in Pactolio's tracked window.
- 12,812,157Shares Held (Latest Filing)
- $186.2MReported Market Value (Latest Filing)
- 9.2%Portfolio Weight (% of 13F Equity Book)
- +4,241,829Quarter-over-Quarter Share Change
- +$16.1MQuarter-over-Quarter Value Change
- 39,847,540Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 35 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 12,812,157 | +4,241,829 | +49.5% | $186.2M | 9.2% | $14.5 |
| Q4 2025 | 8,570,328 | +409,032 | +5.0% | $170.0M | 7.6% | $19.8 |
| Q3 2025 | 8,161,296 | +941,031 | +13.0% | $137.4M | 7.0% | $16.8 |
| Q2 2025 | 7,220,265 | +381,331 | +5.6% | $142.4M | 7.2% | $19.7 |
| Q1 2025 | 6,838,934 | 793,410 | -10.4% | $132.9M | 7.1% | $19.4 |
| Q4 2024 | 7,632,344 | 357,980 | -4.5% | $135.3M | 6.4% | $17.7 |
| Q3 2024 | 7,990,324 | 218,184 | -2.7% | $152.2M | 7.2% | $19.1 |
| Q2 2024 | 8,208,508 | 332,176 | -3.9% | $133.5M | 5.8% | $16.3 |
| Q1 2024 | 8,540,684 | 299,727 | -3.4% | $169.2M | 6.5% | $19.8 |
| Q4 2023 | 8,840,411 | 156,755 | -1.7% | $166.9M | 6.4% | $18.9 |
| Q3 2023 | 8,997,166 | 327,081 | -3.5% | $198.2M | 7.3% | $22.0 |
| Q2 2023 | 9,324,247 | 1,942,421 | -17.2% | $182.2M | 6.4% | $19.5 |
| Q1 2023 | 11,266,668 | 767,914 | -6.4% | $207.4M | 7.0% | $18.4 |
| Q4 2022 | 12,034,582 | 1,876,157 | -13.5% | $214.7M | 7.5% | $17.8 |
| Q3 2022 | 13,910,739 | 2,225,453 | -13.8% | $263.5M | 6.6% | $18.9 |
| Q2 2022 | 16,136,192 | 26,928 | -0.2% | $360.3M | 7.6% | $22.3 |
| Q1 2022 | 16,163,120 | 4,065,220 | -20.1% | $359.0M | 6.3% | $22.2 |
| Q4 2021 | 20,228,340 | +1,878,547 | +10.2% | $436.1M | 7.3% | $21.6 |
| Q3 2021 | 18,349,793 | 641,051 | -3.4% | $340.6M | 6.5% | $18.6 |
| Q2 2021 | 18,990,844 | +2,843,544 | +17.6% | $381.7M | 7.7% | $20.1 |
| Q1 2021 | 16,147,300 | 1,269,939 | -7.3% | $321.7M | 6.9% | $19.9 |
| Q4 2020 | 17,417,239 | 10,660,998 | -38.0% | $303.9M | 6.8% | $17.4 |
| Q3 2020 | 28,078,237 | 1,080,232 | -3.7% | $328.5M | 8.5% | $11.7 |
| Q2 2020 | 29,158,469 | 273,407 | -0.9% | $282.0M | 7.0% | $9.7 |
| Q1 2020 | 29,431,876 | 3,348,581 | -10.2% | $259.3M | 6.2% | $8.8 |
| Q4 2019 | 32,780,457 | 1,153,634 | -3.4% | $444.2M | 7.4% | $13.6 |
| Q3 2019 | 33,934,091 | 719,005 | -2.1% | $386.5M | 6.7% | $11.4 |
| Q2 2019 | 34,653,096 | 1,182,568 | -3.3% | $388.5M | 6.4% | $11.2 |
| Q1 2019 | 35,835,664 | 4,011,876 | -10.1% | $465.9M | 6.7% | $13.0 |
| Q4 2018 | 39,847,540 | +2,798,782 | +7.6% | $398.1M | 5.7% | $10.0 |
| Q3 2018 | 37,048,758 | +76,151 | +0.2% | $581.7M | 7.0% | $15.7 |
| Q2 2018 | 36,972,607 | 294,000 | -0.8% | $607.1M | 6.8% | $16.4 |
| Q1 2018 | 37,266,607 | 1,001,551 | -2.6% | $490.1M | 6.0% | $13.2 |
| Q4 2017 | 38,268,158 | +27,175,639 | +245.0% | $588.6M | 7.3% | $15.4 |
| Q3 2017 | 11,092,519 | — | — | $171.7M | 2.1% | $15.5 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did SOUTHEASTERN ASSET MANAGEMENT INC/TN/ first disclose a MAT position in 13F-HR filings?
SOUTHEASTERN ASSET MANAGEMENT INC/TN/ first reported MATTEL INC (MAT) on its 13F-HR filing for the period ending 2017-09-30 (Q3 2017). The position has appeared on 35 reported quarters within Pactolio's tracked window.
What was SOUTHEASTERN ASSET MANAGEMENT INC/TN/'s most recent quarter-over-quarter share-count change in MAT?
Between Q4 2025 and Q1 2026, SOUTHEASTERN ASSET MANAGEMENT INC/TN/ added 4,241,829 shares of MAT (+49.5%), bringing the total reported position to 12,812,157 shares at a market value of $186.2M.
Does the implied price-per-share represent SOUTHEASTERN ASSET MANAGEMENT INC/TN/'s cost basis in MAT?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.